If the Walhalla-Galop was in the 1845 edition at all, it was no. 3, 4, 6 or 11 in that set. (The other 8 are accounted for.) The composer whose tune is "arranged" here is not identified, nor does it seem obvious. (Also, the referent of Walhalla could be to mythology or to one of the towns or cities by that name in the United States.)

Misc. Comments

2 Different Versions (1845, 1847?) at least of opus 51- what was no.10 in one became no.9 in another, etc. The list under Number of Movements/Sections is for the 1847 version only. Almost all of the Galops are described as arrangements of works by others (probably more properly galops based on melodies in the operas and other works in question, unless the originals themselves are galops with trios exactly and all Viereck did was arrange them for piano. ... Will have to go to the scores of e.g. Balfe's Bohemian Girl, and see.) The "Electrogalvanic" galop, after Strauss, may be based on Johann Strauss Sr.'s waltz opus 125 (Elektrische Funken), from 1840 or so.

The dedicatees may have been among the composer’s pupils.

Viereck also attached opus 51 to several other pieces, including Fantaisie printaniére : sur l'air allemand So lieblich, so wonniglich, published (also by Fiot) in 1852.